When working, the EOH Disc is the best. But keep in mind you are trading a time-tested reliable braking system (surge) for something dependent upon electronics, wiring, and a good connection between the truck and trailer plug. You've just added a lot of places for the system to fail, and probably with an EOH, when it fails it will stop working completely.
We're all motivated by our own scary experience, and mine was an electric braking system that failed, and took fuses with it, on the Interstate. EOH is a nice system, and one of my trailers has it. The other has surge. In the mountains I prefer the EOH, because the gearing down of the TV does not cause the surge to lightly drag the trailer brakes, and cause trailer brake fade. (If you ride the TV brakes going down hills, causing them to fade and therefore lose surge brakes, well, that's operator error).
I'm not claiming one brake system is better than the other, just trying to point out that surge does have some advantages others often overlook. No matter what though, Disc is the way to go!